Planet c has a tilt of zero degrees. what seasonal changes would be expected on this planet? extreme temperature changes between seasons no change in temperatures between seasons seasonal changes along the equator only seasonal changes at the poles only

"Tilt of zero degrees" means the planet's rotation axis is "straight up and down".

...  No place on the planet has any seasons.
...  The climate at every place is the same all year around.
...  No place on the planet has any changes in the length of its days.
...  Every place on the planet has 50% light and 50% dark, every day.
...  At the poles, the sun goes around and around and around the horizon.